Iron core height measuring device and measuring method

Abstract

The invention discloses an iron core height measuring device which comprises a light source shooting assembly, a moving assembly, a control assembly and an iron core pressing assembly. The iron core punching sheets are stacked between a pressing ring of the iron core pressing assembly and the iron core press-fitting platform, and tooth pressing plates are further arranged on the portions, making contact with the iron core punching sheets, of the iron core punching sheets. The outer circle of the iron core punching sheet is provided with a mark notch structure, and a continuous groove is formed after lamination and used for measuring the height of the iron core by the light source shooting assembly; the light source shooting assembly is arranged on the moving assembly; under the control action of the control assembly, the distance between the light source shooting assembly and the iron core pressing assembly and the height of the light source shooting assembly are adjustable under driving of the movement assembly. The invention further discloses a measuring method, data shot by the outer surface of the iron core is analyzed through the iron core height measuring device, the height of the iron core is calculated, under the help of the machine vision detection technology, the height of the iron core is accurately measured, and the automatic measuring process is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of motor detection equipment, and more specifically, to a core height measurement device and a measurement method. Background Art

[0002] During the motor production process, measuring the core height under pressure is an important step in the manufacturing process of the motor stator core and rotor core. It is the key to ensuring the motor stacking coefficient. The core stacking height dimensions must be strictly controlled and measured during the production of the motor stator core and rotor core.

[0003] In the prior art, manual lamination and manual inspection are basically adopted. Usually, when an oil press presses the core, a vernier caliper (applicable to the notch of the core outer circle mark or the notch of the buckle) or a steel ruler is used to measure the height value of the core, and the core is punched with more or less sheets according to the obtained results.

[0004] However, using a vernier caliper or a steel ruler to measure the core height is a manual measurement with low measurement efficiency. At the same time, when using a vernier caliper or a steel ruler, it should be ensured that the measuring tool is kept vertical to the core, otherwise it is easy to cause measurement errors. Moreover, when measuring, it is usually necessary to enter a relatively closed and pressurized hydraulic press to operate, which poses a safety hazard.

[0005] Therefore, there is an urgent need for an automatic motor core height measuring device that can realize the automation of the core height measurement process and automatic data collection, improve the automation level of detection and the accuracy of the detection results, and improve the production safety of the core height measurement process. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a core height measuring device, which uses machine vision detection technology to accurately measure the core height when the core is in a stacked state, thereby realizing an automated measurement process.

[0007] The present application provides a core height measuring device, the specific technical scheme of which is as follows, including: a light source shooting component, a motion component, a control component, and a core pressing component; The core pressing assembly specifically includes: a pressing ring and a core pressing platform; The core punching sheets are stacked and arranged between the pressing ring and the core press-fitting platform, and the bottom of the pressing ring and the top of the core press-fitting platform are also provided with tooth pressure plates in contact with the core punching sheets; The outer circle of the core punching sheet is provided with a marking notch structure, and a continuous groove along the height direction is formed on the outer circle of the core after lamination, which is used to measure the core height; The light source shooting component is arranged on the motion component; Under the control of the control component, the distance and height between the light source shooting component and the core pressing component can be adjusted under the drive of the motion component; The control component analyzes the data captured by the outer surface of the core through the light source shooting component and calculates the core height.

[0008] Preferably, the motion component specifically includes: a distance activity unit and a height activity unit; The distance movable unit is used to adjust the distance between the light source shooting component and the core pressing component; The height movable unit is used to adjust the height of the light source shooting component and the iron core pressing component.

[0009] Preferably, the distance movable unit and the height movable unit are individually connected to the output shaft of the servo motor and are independently controlled by the control component.

[0010] Preferably, the control component is specifically a processing chip capable of receiving and processing digital signals.

[0011] Preferably, the control component also includes a console for controlling the motion component.

[0012] Preferably, the control component also includes a display unit for real-time display and operation of the data captured by the light source shooting component.

[0013] Preferably, the processing chip and the display unit are integrated in the console.

[0014] Preferably, the specific light source of the light source shooting component is one of LED light source, halogen fiber light source, high-frequency fluorescent light source, or a combination of multiple thereof; the specific shooting component is a CCD camera.

[0015] Preferably, the core pressing assembly can rotate around its center of a circle so that the light source shooting assembly can shoot the circumference of the core punching sheet.

[0016] At the same time, the present application also provides a core height measurement method using the core height measurement device, and the specific measurement steps are as follows: (1) Core stacking: the core punching sheets are stacked and arranged between the pressing ring and the core pressing platform, and are stacked by a pressing device, so that the outer circle of the core punching sheets is provided with a marking notch structure, and a continuous groove along the height direction is formed on the outer circle of the stator core after stacking. The surface color and contour difference formed by the groove can be used by the shooting component to identify and distinguish the core and the tooth pressure plate; (2) Distance calibration: adjusting the distance and height between the light source shooting component and the core pressing component through the motion component; In terms of distance adjustment, it is ensured that the distance between the light source shooting component and the surface of the iron cores with different outer diameters is consistent, so that the detection of the iron cores with different outer diameters can be realized; In terms of height adjustment, it is ensured that the light source shooting component can cover an area that meets the detection of different types of core heights, and can realize the detection of cores of different heights and sizes; (3) Height detection: Move the light source shooting component to the bottom of the core so that the field of view of the light source shooting component covers the bottom of the core and the joint position of the lower tooth pressure plate, take a photo of the outer surface of the core, visually identify the position of the bottom edge of the core, and calculate the starting position value h1 of the bottom of the core based on the height when taking the photo and the visually identified position of the bottom edge of the core; Move the shooting assembly upward so that the field of view of the light source shooting assembly covers the top of the core and the joint position of the upper tooth pressure plate; take a picture of the outer surface of the core again, identify the position of the upper edge of the core by vision, and calculate the core top position value h2 based on the height of the picture taken this time and the visually identified position of the upper edge of the core; The core height H=h2-h1 is calculated by the difference between the two visual inspection photos and the servo movement distance.

[0017] The core height measuring device provided by the present invention comprises a light source and a shooting component, a control component and a motion component, and realizes automatic detection of the core height by dynamically shooting and measuring the core.

[0018] The core height measuring device provided by the present invention can be arranged outside the hydraulic press, and the detection process is non-contact measurement with the core and the hydraulic press, the installation and operation space are not limited, and the device has good integration and coordination with the core pressing device; the detection process is unmanned, eliminating safety hazards. The light source and the shooting component are controlled by the motion component to move up and down and forward and backward to ensure that the light source and the camera field of view coverage area can meet the rapid detection of cores of different outer diameters and different height sizes, thereby improving the detection efficiency of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1A schematic structural diagram of a core height measuring device provided in an embodiment of the present invention; Figure 2 It is a schematic diagram of the top view structure of the core punching sheet.

[0021] Figure numerals: 1. Pressing ring; 2. Tooth pressure plate; 3. Iron core; 4. Marking notch; 5. Height movable unit; 6. Light source shooting assembly; 7. Distance movable unit; 8. Iron core pressing platform; 9. Iron core punching sheet. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0026] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0027] This specific embodiment of the present invention is written in a progressive manner.

[0028] like Figure 1 to Figure 2 As shown, an embodiment of the present invention provides a core height measuring device, which mainly includes: a light source shooting component 6, a motion component, a control component, a core pressing component, and several major functional components; The core pressing assembly is the main assembly for stacking and pressing the core 3 punching sheets, and can be arranged outside the hydraulic press. Its specific composition structure is as follows: Figure 1 As shown, it includes: a pressing ring 1 and a core pressing platform; The core punching sheets 9 are stacked between the pressing ring 1 and the pressing platform of the core 3 along the height direction, and the bottom of the pressing ring 1 and the top of the pressing platform of the core 3 are also provided with tooth pressure plates 2 in contact with the core 3 punching sheets; like Figure 2 As shown, in this embodiment, the outer circle of the core punching sheet 9 is provided with a marking notch 4 structure, and a continuous groove along the height direction is formed on the outer circle of the laminated core 3. Specifically in this embodiment, the surface color and contour difference formed by the groove can be used for the light source shooting component 6 to identify and distinguish the core 3 and the tooth pressure plate 2, so as to measure the height of the core 3 by the light source shooting component 6; The motion component provides an installation position for the light source shooting component 6, so that the light source shooting component 6 can be movably arranged on the motion component; In this embodiment, if Figure 1 As shown, under the control of the control component, the distance and height between the light source shooting component 6 and the iron core 3 pressing component can be adjusted under the drive of the motion component; This facilitates the control component to analyze the data captured by the light source shooting component 6 on the outer surface of the core 3 and calculate the height of the core 3; Compared with the manual detection of the height size of the core 3 in the prior art, the measurement efficiency is low. When using a vernier caliper or a steel ruler, it should be ensured that the measuring tool is kept vertical to the core 3, otherwise it is easy to cause measurement errors. Using the measuring device provided by the present application, the detection process and the core 3 and the hydraulic press are all non-contact measurements, the installation and operation space are not restricted, and the device has good integration and coordination with the core pressing device; the detection process is unmanned, eliminating safety hazards.

[0029] Preferably, the motion component in this embodiment is further limited. In this embodiment, Figure 1 As shown, the specific structure of the motion component includes: a distance activity unit 7, a height activity unit 5; The distance movable unit 7 can be moved in the horizontal direction to adjust the distance between the light source shooting component 6 and the iron core 3 pressing component; The height movable unit 5 can be moved in the vertical direction to adjust the height of the light source shooting component 6 and the iron core 3 pressing component.

[0030] Preferably, the motion component in this embodiment is further limited. In this example, the distance movable unit 7 and the height movable unit 5 are individually connected to the output shaft of the servo motor, and are independently controlled by the control component and controlled by the servo motor, so that more precise motion adjustment can be achieved.

[0031] Preferably, the control component in this embodiment is further limited, and specifically is a processing chip capable of receiving and processing digital signals. Since it is necessary to perform visual inspection on the image captured by the light source shooting component 6 and perform image analysis on the height of the core 3, the control component is required to have certain image processing capabilities.

[0032] Furthermore, in order to facilitate the control of the motion component, the control component also includes a console for controlling the motion component to improve the convenience of measurement.

[0033] Furthermore, the control component also includes a display unit for real-time display and operation of the data captured by the light source shooting component 6 to provide data visualization.

[0034] Furthermore, the control component in this embodiment is further limited, and the processing chip and the display unit are integrated in the console to facilitate reducing the size of the device.

[0035] Preferably, the light source shooting component 6 in this embodiment is further limited. In this embodiment, the specific light source of the light source shooting component 6 is one of LED light source, halogen fiber optic light source, high-frequency fluorescent light source, or a combination of multiple light sources; the specific shooting component is a CCD camera.

[0036] Preferably, the light source shooting component 6 in this embodiment is further limited, and the core 3 pressing component can rotate around its center of the circle, so that the light source shooting component 6 can shoot the circumference of the core 3 punching sheet to facilitate finding the groove formed by the outer circle of the core 3 that is continuous in the height direction.

[0037] At the same time, this embodiment also discloses a core height measurement method including the core height measurement device. In this embodiment, the core height measurement method has the following specific measurement steps: (1) Iron core stacking: the iron core punching sheets 9 are stacked and arranged between the pressing ring 1 and the iron core pressing platform, and are stacked by using a pressing device, so that the outer circle of the iron core punching sheets 9 is provided with a marking notch 4 structure, and a continuous groove along the height direction is formed on the outer circle of the stator iron core 3 after stacking. The surface color and contour difference formed by the groove can be used by the shooting component to identify and distinguish the iron core 3 and the tooth pressure plate 2; (2) Distance calibration: adjusting the distance and height between the light source shooting component 6 and the core pressing component through the motion component; In terms of distance adjustment, it is ensured that the distance between the light source shooting component 6 and the surface of the iron core 3 with different outer diameters is consistent, so that the detection of the iron core 3 with different outer diameters can be realized; In terms of height adjustment, it is ensured that the light source shooting component 6 can cover an area that satisfies the detection of the heights of the cores 3 of different models, and can realize the detection of the cores 3 of different height sizes; (3) Height detection: Move the light source shooting component 6 to the bottom of the core 3 so that the field of view of the light source shooting component 6 covers the bottom of the core 3 and the joint position of the lower tooth pressure plate 2, take a photo of the outer surface of the core 3, and visually identify the position of the upper edge of the core 3 by the surface color and contour differences formed by the groove of the mark notch 4. Based on the height when taking the photo and the visually identified bottom edge position of the core 3, calculate the starting position value h1 of the bottom of the core 3; Move the shooting assembly upward so that the field of view of the light source shooting assembly 6 covers the top of the core 3 and the joint position of the tooth pressure plate 2; take a picture of the outer surface of the core 3 again, and visually identify the position of the upper edge of the core 3 by the surface color and contour difference formed by the groove of the mark notch 4, and calculate the top position value h2 of the core 3 based on the height of the picture taken this time and the visually identified upper edge position of the core 3; The height H = h2-h1 of the core 3 is calculated by the difference between the two visual inspection photos and the servo movement distance.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A core height measuring device, characterized in that: include: Light source shooting assembly, motion assembly, control assembly, core pressing assembly; The core pressing assembly specifically includes: a pressing ring and a core pressing platform; The core punching sheets are stacked and arranged between the pressing ring and the core press-fitting platform, and the bottom of the pressing ring and the top of the core press-fitting platform are also provided with tooth pressure plates in contact with the core punching sheets; The outer circle of the core punching sheet is provided with a marking notch structure, and a continuous groove along the height direction is formed on the outer circle of the core after lamination, which is used to measure the core height; The light source shooting component is arranged on the motion component; Under the control of the control component, the distance and height between the light source shooting component and the core pressing component can be adjusted under the drive of the motion component; The control component analyzes the data captured by the outer surface of the core through the light source shooting component and calculates the core height.

2. The core height measuring device according to claim 1, characterized in that: The motion components specifically include: a distance activity unit and a height activity unit; The distance movable unit is used to adjust the distance between the light source shooting component and the core pressing component; The height movable unit is used to adjust the height of the light source shooting component and the iron core pressing component.

3. The core height measuring device according to claim 2, characterized in that: The distance movable unit and the height movable unit are both individually connected to the output shaft of the servo motor and are independently controlled by the control component.

4. The core height measuring device according to claim 3, characterized in that: The control component is specifically a processing chip capable of receiving and processing digital signals.

5. The core height measuring device according to claim 4, characterized in that: The control component also includes a control console for controlling the motion component.

6. The core height measuring device according to claim 5, characterized in that: The control component also includes a display unit for real-time display and operation of the data captured by the light source shooting component.

7. The core height measuring device according to claim 6, characterized in that: The processing chip and the display unit are integrated in the console.

8. The core height measuring device according to any one of claims 1 to 7, characterized in that: The specific light source of the light source shooting component is one of LED light source, halogen fiber light source, high-frequency fluorescent light source, or a combination of multiple light sources; the specific shooting component is a CCD camera.

9. The core height measuring device according to claim 8, characterized in that: The core pressing assembly can rotate around its center of a circle so that the light source shooting assembly can shoot the circumference of the core punching sheet.

10. A method for measuring the height of a core, by using the core height measuring device according to any one of claims 1 to 9, to measure the height of stacked core punching sheets, characterized in that: The specific measurement steps are as follows: (1) Core stacking: the core punching sheets are stacked and arranged between the pressing ring and the core pressing platform, and are stacked by a pressing device, so that the outer circle of the core punching sheets is provided with a marking notch structure, and a continuous groove along the height direction is formed on the outer circle of the stator core after stacking. The surface color and contour difference formed by the groove can be used by the shooting component to identify and distinguish the core and the tooth pressure plate; (2) Distance calibration: adjusting the distance and height between the light source shooting component and the core pressing component through the motion component; In terms of distance adjustment, it is ensured that the distance between the light source shooting component and the surface of the iron cores with different outer diameters is consistent, so that the detection of the iron cores with different outer diameters can be realized; In terms of height adjustment, it is ensured that the light source shooting component can cover an area that meets the detection of different types of core heights, and can realize the detection of cores of different heights and sizes; (3) Height detection: Move the light source shooting component to the bottom of the core so that the field of view of the light source shooting component covers the bottom of the core and the joint position of the lower tooth pressure plate, take a photo of the outer surface of the core, visually identify the position of the bottom edge of the core, and calculate the starting position value h1 of the bottom of the core based on the height when taking the photo and the visually identified position of the bottom edge of the core; Move the shooting assembly upward so that the field of view of the light source shooting assembly covers the top of the core and the joint position of the upper tooth pressure plate; take a picture of the outer surface of the core again, identify the position of the upper edge of the core by vision, and calculate the core top position value h2 based on the height of the picture taken this time and the visually identified position of the upper edge of the core; The core height H=h2-h1 is calculated by the difference between the two visual inspection photos and the servo movement distance.

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